TRIZ Principle No. 23

Introduce feedback (referring back, cross-checking) to improve a process or action.
  • Fitness watch alerting when heart rate exceeds the target exercise zone.
  • Automatic volume control in audio circuits
  • Signal from gyrocompass is used to control simple aircraft autopilots.
  • Statistical Process Control (SPC) -- Measurements are used to decide when to modify a process. (Not all feedback systems are automated!)
  • Budgets --Measurements are used to decide when to modify a process.

If feedback is already used, change its magnitude or influence.
  • Change sensitivity of an autopilot when within 5 miles of an airport.
  • Change sensitivity of a thermostat when cooling vs. heating, since it uses energy less efficiently when cooling.
  • Change a management measure from budget variance to customer satisfaction.
  • AI code generation tool that self-audits and corrects its own errors before delivering the result.